Hi.
Firstly i am not a doctor, but there is a doctor forum on here where you can post your question to a doctor.
Regarding thinking you have CSF, because of fatigue, dizziness, etc, then these symptoms could also be contributed to many auto-immune diseases, also , these symptoms are what people describe when they have auto-immune diseases, so dont rule out Lupus, Sjorgens, etc,etc.
What i would say to you is go and see a good rheumatologist, and have a full auto-immune antibody blood profile done, along with kidney and liver function blood tests, and full blood count, with inflammation markers, etc, etc,
Then go from there, im sure the bloodtests which the rheumatologist will perorm may pick-up an indicator to what maybe wrong.
I would also get your vitamin, D, along with B vitamins checked too,
Dont write yourself off with CSF, even though you think this might be the reason to you feeling like this.
If it is auto-immune linked, then you will need the appropiate treatment for the condition you are suffering, and trust me Lupus can be one condition which can be hard to treat. So you will need a good Lupus Specialist, to help you.
Kidney problems, can be associated to Lupus, and maybe you nephrologist has seen this before in a Lupus patient, I think your Neprologist has got your best interest at heart, and i would be shaking his hand to thank him for being efficient in his findings.
Good Luck
Nicola
Not a doctor but had proteinuria and lost a kidney. Had the exact same symptoms for years til a new doctor took over the office.